Hi there, I had a MCQ that made me confused. I need answer and why.
here's the question
"Johnny could not____his neighbor. He was with me last night."
(A)kill (B)killed (C)have killed (D)had killed
I know the answer now, but I did wrong at first. i just don't know why

I found the answercould not have+Vpp = impossible

Thanks for sharing

Thank you for sharing.